Filter.



No. 727,374. 'PATENTED MAY 5, 1903. G. W. JOHNSTON.

FILTER.

APPLIOATION I'QILED AUG. 9, 1902.

N0 MODEL we uonms PETERS no, motoumou wAsmnarou. o. c;

Nirnn STATES Patented May 5,1903.

PATENT OFFICE.

FILTER.

SPECIFICATION forming part of Letters Patent No. 727,374, dated May 5, 1903. Application filed August 9, 1902- Sarial No. 119,000. (No model.)

To all whom it petty concern:

Be it known that I, GEORGE W. JOHNSTON, a citizen of the United Statesflresiding in the borough of Brooklyn, in the county of Kings, city and State of New York, have invented an Improvement in Filters, of which the following is a specification.

My invention relates to the class of filters adapted to be attached to the threaded end of a faucet of ordinary construction for special use in the household; and the object of my invention is not only to simplify the construction, but to provide a filter the contents of which can be removed either for cleansing or to be replaced by fresh filtering material.

I provide a cylindrical sheet-metal case one end of which is contracted and open and the opposite end of which is threaded, and so adapted to screw upon the threaded end of a faucet of ordinary construction. I provide a hemispherical filter-plate of wire-gauze or perforated metal and means for supporting the same Within the cylindrical sheet-metal case adjacent to the contracted open end. I also provide a perforated plate that is removable and supported within the said cylindrical sheet-metal case adjacent to the end distant from that holding the hemispherical filter-plate. This perforated plate is held in place under normal conditions by a rubber ring, and when the said case is connected to the threaded end of a faucet the same bears against the rubber ring, and so acts to hold the perforated plate to its seat. Between the perforated plate and the hemispherical filterplate the cylindrical sheet-metal case is to be filled with filtering material. This rubber ring and the perforated plate are readily removable from the sheet-metal case, so as to cleanse the filtering material or to replace the same with fresh material.

In the drawings, Figure 1 is a vertical section representing my improvement as attached to the threaded end of a faucet of ordinary construction. Fig. 2 is an inverted plan of the same. Fig. 3 is an elevation, partially in section, of a form of the filter detached from a faucet; and Fig. 4 is a plan, which may be either a plan of the parts Fig. 1 when the same is removed from the faucet or a plan of the part Fig. 3.

The cylindrical sheet-metal case a is provided with a contracted open end a, with a threaded opposite end a with an annular groove 2 adjacent to the threaded end a and forming an internal shoulder 3. An annular bead at comes adjacent to the contracted open end a, and this forms a curved internal seat for the hemispherical filter-plate b, which may be of wire-gauze, as shown in Fig. 1, or of perforated metal, as shown in Fig. 3. This hemispherical filter-plate b may occupy one of two positions. As shown in Figs. 1 and 2, it presents, with reference to the contracted open end a, a convex form, its central portion being nearest to the open end, whereas in Fig. 3 its central portion is distant from the contracted open end, and with reference to said end said hemispherical filter-plate is of concave form. The edge or periphery of the hemispherical filter-plate is of curved outline to fit and be received in the internal seat formed by the annular bed 4. This holds the hemispherical filter-plate in position. The same, however, can be forced out of said seat and out of the cylindrical sheet-metal case a at the larger end of said case in like manner to inserting the said part in the case. The filtering material 6 shown within the cylindrical sheet-metal case is omitted in Fig. l where the same would fill into the hemispherical filter-plate b. This has been done for the purpose of clearness in the drawing and so as not to confuse the parts.

0 represents a perforated plate of sheet metal having by preference a depressed center, the perforations being preferably only in the depressed center, and d a rubber ring which fits upon and over said perforated plate. It will be noticed by reference to Fig. 1 that said perforated plate rests upon the shoulder 3, formed by the annular groove 2 of the case. screws upon the threaded end of a faucetf of ordinary construction, and in so doing the end of the faucet comes with force against the upper surface of the rubber ring to press the same upon the plate 0 and to press the plate to its seat upon the shoulder 3.

When it is desired to remove the filtering material for cleansing or to replace the same with fresh material the parts are separated from the faucet; the rubber ring dis removed, the plate 0 is also removed from the case, af-

The threaded end a of the case ter which the filtering material readily falls out or may be shaken out. The case may then be cleansed thoroughly with water, and the same filtering material after being thoroughly washed may be replaced in the case or fresh material substituted therefor, after which the plate 0 and the rubber ring are replaced, and the case may be again screwed upon the faucet.

From the construction Fig. 1 it will be observed that the larger portion of the water passing through the filter will pass away from the central portion of the hemispherical filter-plate bthat is, the center of the convex portion-that at the same time the sediment will collect at the same place and will tend to fill in and impede the exit of the water, which will progressively pass through said filter-plate b nearer to the inner surface of the case, while from the construction Fig. 3 it will be noticed that the filling-up tendency of the deposited matter in the filtering material e will tend to lie in the recess formed by the case and the upwardly extending hemispherical filter-plate Z), thus leaving the holes or perforations of the hemispherical filter-plate free for the exit of the water, and that while this deposit accumulates the tendency will be to approach the center, closing up the outermost perforations of said plate first, the water always passing away clear at r the center.

The hemispherical filter-plate his not intended to be removed, as the same can be thoroughly cleansed by water against first one surface and then the other.

This filter device is exceedingly simple and is composed of very few parts. Said parts are accessible and removable not only to cleanse the same, but to remove and cleanse or replace' the filtering material held within the case.

I do not herein limit myself to the character'or composition of the filtering material 6 within the case and between the plates, as the same may be of any desired character, nor do I limit myself to the outline or appearance or form of the surface of the cylindrical sheet-metal case between the contracted open end and the opposite threaded end. I prefer and have shown this portion of the case as corrugated, as the same not only presents an ornamental appearance, but stiffens the sheet-metal case and prevents the same indenting.

I do not limit myself to the filter-plates of wire-gauze or perforated metal or to the position of the hemispherical filter-plates.

I claim as my invention 1. In a filter, the combination with a cylindrical sheet-metal case open-ended, contracted at one end and threaded at the opposite end, of a hemispherical filter-plate and means for supporting the same adjacent to the contracted open end of the case, a perforated plate, a support therefor in the case, a rubber ring adapted to set upon said perforated plate and against which the threaded end of a faucet of ordinary construction is adapted to bear, and filtering material between said plates, substantially as set forth.

2. In a filter, the combination with a cylindrical sheet-metal case open-ended, contracted at one end, threaded at the opposite end, provided with an annular groove 2 forming an internal shoulder 3 and an annular bead 4E forming a curved internal seat, of a hemispherical filter-plate having a curved edge or periphery received in and supported by the internal seat of the bead 4, a removable perforated plate 0 adjacent to the opposite end of the filter and adapted to be supported by the shoulder 3, a rubber ring 01 fitting within the threaded end of the filter-case and simultaneously resting upon the perforated plate 0 and fitting against the inner surface of the cylindrical sheet-metal case, and filtering material between said plates, substantially as specified.

Signed by me this 2d day of July, 1902.

GEORGE VJ. JOHNSTON. Witnesses:

GEO. T.PINOKNEY, BERTHA M. ALLEN. 

